Mariamman Teppakulam is a 1000 ft long and 950 ft wide huge square tank situated at the eastern end of the city, about 5 km to the east of Meenakshi temple. The tank believed to be built by King Thirumalai Nayak in 1646, is connected to river Vaigai through underground channels. It is the venue of the annual Float festival. 

An idol of Lord Vinayaka is installed on a mandapam at the center of the Teppakulam (tank) which is surrounded by other four small mandapams. It is said that this idol has been discovered from the earth during the construction of the Thirumalai Nayak Mahal. The annual float festival also known as 'Theppam' Festival of the Meenakshi temple is celebrated at the Teppakulam on the full moon day (Thaipoosam day) of the Tamil month Thai (January/February). At that time the center mandapam is illuminated with colorful lights and temple deities are brought to it in decorated floats called 'Theppam'. Celebrated with huge enthusiasm and pleasure, this festival attracts thousands of tourists from far and near.

There is a temple on the Northern side of the tank which is dedicated to Mariamman, a famous deity of Tamil Nadu.